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Xblade Of Heaven
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 Posted: Thu Oct 13, 2016 12:17 pm Post subject: small dude using instructions |
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Hi all guys, to see if anyone can help
i have a problem using 2 instrucions.
For example i ca use this
| Code: | fild dword ptr [eax+44]//load a integer value
fstp dword ptr [eax+40]//store a float value |
is corret, but now i try this:
| Code: | fild dword ptr [eax+44]//load a integer value
fistp dword ptr [eax+40]//store a integer value |
and in this second case the loaded value change to a wrong value, anyone can explain me why? thanks!
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ParkourPenguin
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| Posted: Thu Oct 13, 2016 12:23 pm Post subject: |
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Could you be more specific and say what the values are?
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Xblade Of Heaven
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| Posted: Thu Oct 13, 2016 12:33 pm Post subject: |
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yep
are the hp values, max and current values
100 in 4bytes
eax+44 store max hp 100 and eax+40 is current HP
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ParkourPenguin
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| Posted: Thu Oct 13, 2016 12:40 pm Post subject: |
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Works perfectly fine for me. fild converts the 4-byte value to extended and loads it onto the FPU stack, and fistp converts the extended value back to 4-byte, stores it at that address, and pops the FPU stack.
By asking that question, I meant more so what value fistp was storing and what value you intended for it to store.
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Xblade Of Heaven
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| Posted: Thu Oct 13, 2016 1:14 pm Post subject: |
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yeah, is working fine... is my fault wrong instruction position...
thanks man, regards
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Zanzer
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| Posted: Thu Oct 13, 2016 1:18 pm Post subject: |
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| Code: | | fild dword ptr [eax+44] |
Loads integer 100 (hex 00000064) as float 100 (hex 42C80000) to FPU stack.
| Code: | | fstp dword ptr [eax+40] |
Pops float 100 (hex 42C80000) as float 100 (hex 42C80000) from FPU stack.
| Code: | | fistp dword ptr [eax+40] |
Pops float 100 (hex 42C80000) as integer 100 (hex 00000064) from FPU stack. |
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Xblade Of Heaven
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| Posted: Thu Oct 13, 2016 2:29 pm Post subject: |
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thanks 
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